Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (4): 63-75.doi: 10.12108/yxyqc.20210407

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Geochemical characteristics and paleoenvironmental significance of Upper Carboniferous sedimentary strata in Malang Sag， Santanghu Basin

CHEN Yajun1, JING Wenbo2, SONG Xiaoyong1, HE Bobin2, WU Hongmei1, WANG Rui2, XIE Shijian2, SONG Kaihui2, MA Qiang3   

  1. 1. China United Academy of Petroleum Sciences, Beijing 100101, China;
    2. Research Institute of Exploration and Development, PetroChina Tuha Oilfield Company, Hami 839009, Xinjiang, China;
    3. Research Institute of Exploration and Development, PetroChina Yumen Oilfield Company, Jiuquan 735019, Gansu, China
  • Received:2020-07-27 Revised:2020-09-29 Online:2021-08-01 Published:2021-08-06

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Abstract: In order to distinguish the paleoenvironment of sedimentary interbeds during the interval of Upper Carboniferous volcanic eruption in Malang Sag,Santanghu Basin,based on the trace element test results of sedimen-tary interbed samples from lava and pyroclastic rocks of Upper Carboniferous Kalagang Formation and Haerjiawu Formation,through the study of trace element geochemistry,the index charts identified by U/Th,V/Cr,V（/V+Ni）, V/Sc,Sr/Ba and B/Ga and factor screening analysis were used to distinguish the paleosedimentary environment,so as to understand the redox state of sedimentary medium. The results show that the V/Cr, V/SC, V/（V+Ni）,Sr/Ba and B/Ga ratios of sedimentary interbeds in lava and pyroclastic rocks of Kalagang Formation and Haerjiawu Formation are relatively stable, which can be used as a better combination index for distinguishing paleosedimentary environment. The sedimentary interbeds of Kalagang Formation（C2k）were formed in the transitional facies of water and land and the medium of land oxidation environment,the sedimentary interbeds of Haerjiawu Formation（C2h）were mainly formed in the medium of underwater reduction environment,with little in complex transitional environment of water and land. This geochemical method is universal and can be used to distinguish the paleosedimentary environment of sedimentary strata in volcanic eruption intermission period under different geological times and regional geological conditions.

Key words: trace element, geochemistry, sedimentary paleoenvironment, Kalagang Formation, Haerjiawu Formation, Malang Sag

CLC Number: 

  • TE121.3+1
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